Deck Waterproofing Calculator
Membrane system for occupied space below decks.
Inputs
Results
Total waterproof area (sq ft)
317
Deck surface area (sq ft)240
Primer (gallons)2
Base coat / membrane (gal or rolls)11
Top coat (gallons)4
Sealant tubes17
Estimated material cost ($)$1,151
How to Use This Calculator
- Enter Deck Length (ft) and Deck Width (ft) — the interior dimensions of the deck surface to waterproof.
- Select System Type (1=liquid polyurethane, 2=peel-and-stick sheet membrane, 3=fiberglass/resin).
- Enter Number of Post Penetrations and Wall Contact Length (ft) requiring counter-flashing treatment.
- Set Deck Slope (%) — code minimum is typically 2% (1/4 inch per foot) for positive drainage.
- Review Total Waterproof Area (sq ft), Primer Gallons, Base Coat/Membrane, and Top Coat Gallons to build your material order.
- Use Sealant Tubes count and Estimated Material Cost for bid preparation and procurement.
Ad Placeholder
Related Calculators
Plaza Waterproofing Calculator
Waterproofing assembly for pedestrian plaza over occupied space.
Joint Sealant Calculator
Sealant volume from joint width, depth, and linear footage.
Foundation Waterproofing Calculator
Material and cost from foundation wall area.
Water Infiltration Testing Calculator
Test procedure from wall type and ASTM standard.
Ad Placeholder